using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class ClickToFocus : MonoBehaviour
{
    //[Tooltip("相机在目标物体位置的偏移量")] public Vector3 cameraOffset = new Vector3(5f, 10f, 0f);
    private Dictionary<string, Vector3> targetObjectAndPosition = new Dictionary<string, Vector3>();//尝试使用字典数据类型来定义每一个物体自己对应的观察点位置

    [Tooltip("平滑过渡所用时间（秒)")] public float transitionDuration = 1.0f;
    [Header("双击设置")]
    [Tooltip("双击间隔时间阈值（秒)")] public float doubleClickInterval = 0.3f;
    private float lastClickTime = 0f;
    private bool waitingSecondClick = false;

    private Camera mainCamera;

    public Vector3 core = new Vector3(-219f, 311f, 268f);




    public GameObject lastObj;
    public GameObject currentObj;


    void Start()
    {
        mainCamera = Camera.main;//主相机的那个Camera组件跳转到的观测点
        targetObjectAndPosition.Add("bx_talou", new Vector3(-82f, 37f, -100f));
        targetObjectAndPosition.Add("bx_langqiao", new Vector3(-35f, 30f, -59f));
        targetObjectAndPosition.Add("bx_qiaozha", new Vector3(-26f, 35f, -74f));
        targetObjectAndPosition.Add("bx_zhafang1", new Vector3(-64f, 21f, -102f));
        targetObjectAndPosition.Add("bx_zhafang2", new Vector3(-8f, 26f, -173f));
        targetObjectAndPosition.Add("bx_zhafang3", new Vector3(12f,23f,-37f));
        targetObjectAndPosition.Add("bx_diaosu", new Vector3(-18f,18f,13f));
        targetObjectAndPosition.Add("sb_shujucaijiyi", new Vector3(-26f,19f,11f));
        targetObjectAndPosition.Add("sb_shujucaijiyi (1)", new Vector3(31f,17f,-60f));
        targetObjectAndPosition.Add("bx_zhafang5", new Vector3(53f,26f,-23f));
        targetObjectAndPosition.Add("pj_tingzi", new Vector3(67f,20f,-97f));
    }

    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            if (waitingSecondClick && Time.time - lastClickTime <= doubleClickInterval)
            {
                HandleClick();
                //core = transform.position + new Vector3(-5f, 0f, 0f);
                waitingSecondClick = false;
            }
            else
            {
                waitingSecondClick = true;
                lastClickTime = Time.time;
                StartCoroutine(ResetClickState());
            }

            
        }
    }

    private IEnumerator ResetClickState()
    {
        yield return new WaitForSeconds(doubleClickInterval);
        waitingSecondClick = false;
    }

    private void HandleClick()
    {
        Ray ray = mainCamera.ScreenPointToRay(Input.mousePosition);
        if (Physics.Raycast(ray, out RaycastHit hit, Mathf.Infinity) && hit.collider.CompareTag("Target"))//这里有点小问题，应该给被打中的物体加一个标签，不然正常物体也会影响core
        {
            //出一个hit
            foreach (KeyValuePair<string, Vector3> pair in targetObjectAndPosition)
            {
                if (hit.transform.gameObject.name == pair.Key)
                {
                    Vector3 targetPos = pair.Value;
                    StartCoroutine(MoveCamera(mainCamera, targetPos, transitionDuration, hit.transform));
                }
            }
            core = hit.transform.position;

            //中间夹着的代码为提供红色高亮显示的功能，和双击跳转是分开的
            if (lastObj == null)
            {
                currentObj = hit.collider.GetComponent<Transform>().gameObject;
                currentObj.layer = 6;
            }

            if (lastObj != null)
            {
                currentObj = hit.collider.GetComponent<Transform>().gameObject;
                currentObj.layer = 6;
                lastObj.layer = 0;

            }

            lastObj = currentObj;
            //中间夹着的代码为提供红色高亮显示的功能，和双击跳转是分开的
        }



    }

    private IEnumerator MoveCamera(Camera cam, Vector3 targetPos, float duration, Transform focusTarget)
    {
        Vector3 startPos = cam.transform.position;
        float elapsed = 0f;
        while (elapsed < duration)
        {
            float t = Mathf.Lerp(0f, 1f, elapsed / duration);
            cam.transform.position = Vector3.Lerp(startPos, targetPos, t);
            if (focusTarget != null)
                cam.transform.LookAt(focusTarget);
            elapsed += Time.deltaTime;
            yield return null;
        }
        cam.transform.position = targetPos;
        if (focusTarget != null)
            cam.transform.LookAt(focusTarget);
    }
}